hello,i am fairly new to the mac world(last year) and i recently purchased a powermac g5 with dual 1.8 ghz processor , it will be my first mac desktop and i was wondering how it would compare against my late 2007 2.2 ghz macbook? I plan to upgrade the powermac to at least 4gb of ram and a bigger hard drive. Will it be significantly slower than my macbook or will it be not much of a difference? I plan on running leopard on it. also can i use a magic mouse and trackpad with the powermac?